Net Income per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Calculation of Basic and Diluted Net Income Per Share

The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):

	Years Ended December 31,
	2019		2018		2017
Numerator:
Net income	$	345.0	$	566.9	$	306.2
Denominator:
Weighted-average shares used to compute basic net income per share	343.2		349.0		377.7
Dilutive effect of employee stock awards	5.0		5.4		6.5
Weighted-average shares used to compute diluted net income per share	348.2		354.4		384.2
Net income per share:
Basic	$	1.01	$	1.62	$	0.81
Diluted	$	0.99	$	1.60	$	0.80
Anti-dilutive shares	4.7		3.9		1.1